DS3231 high precision clock module
DS3231 is a low-cost, high-precision I2C real-time clock (RTC), with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device includes a battery input terminal, which can maintain accurate timing when the main power supply is disconnected. The integrated crystal oscillator improves the long-term accuracy of the device and reduces the number of components in the production line. DS3231 offers commercial and industrial temperature ranges, and is packaged in a 16-pin 300mil SO package.
RTC saves seconds, minutes, hours, day of the week, date, month and year information. Months with less than 31 days will automatically adjust the date at the end of the month, including corrections for leap years. The working format of the clock can be 24 hours or 12 hours with /AM/PM indication. Provides two configurable calendar alarms and a configurable square wave output. Address and data are serially transmitted via I2C bidirectional bus.
A precise, temperature-compensated voltage reference and comparator circuit is used to monitor the VCC status, detect power failures, provide a reset output, and automatically switch to a backup power supply when necessary. In addition, the /RST monitor pin can be used as a manual input to generate a ?P reset.
In addition to high timing accuracy, DS3231 also has some other functions, which expand the additional functions and selection range of the system host. The device integrates a very accurate digital temperature sensor, which can be accessed through the I2C* interface (as time). The accuracy of this temperature sensor is ±3°C. The on-chip control circuit can realize automatic power detection and manage power switching between the main power supply and the backup power supply (ie, low-voltage battery). If the main power supply fails, the device can still provide accurate timing and temperature without affecting performance. When the main power supply is re-energized or the voltage value returns to the allowable range, the on-chip reset function can be used to restart the system microprocessor.
Module parameters:
1. Size: 38mm (length) * 22mm (width) * 14mm (height)
2.Weight: 8g
3. Working voltage: 3.3--5.5V
4. Clock chip: high-precision clock chip DS3231
5. Clock accuracy: within the range of 0-40?, the accuracy is 2ppm, the annual error is about 1 minute
6. With 2 calendar alarm clocks
7. Programmable square wave output
8. The real-time clock generates seconds, minutes, hours, day of the week, date, month and year, and provides leap year compensation with a valid period of up to 2100
9. The chip has its own temperature sensor with an accuracy of ±3?
10.Memory chip: AT24C32 (storage capacity 32K)
11.IIC bus interface, the highest transmission speed is 400KHz (when the working voltage is 5V)
12. Can be cascaded with other IIC devices, the 24C32 address can be modified by short-circuiting A0/A1/A2, the default address is 0x57
13.With battery CR2032, to ensure that the clock still moves normally after the system is powered off
14.Packing method: single anti-static packaging
Wiring instructions (take Arduino uno r3 as an example):
SCL?A5
SDA?A4
VCC?5V
GND?GND
Shipping list:
1. One DS3231 module